# LM317LIPW

**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TSSOP-8

LM317LIPW from Texas Instruments, in a TSSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | INPUT | power_in | Unregulated supply input; the datasheet recommends an input-to-output differential of 2.5 V to 37 V and gives an absolute maximum input-to-output differential of 45 V for the new die (CSO: RFB). |
| 2 | NC | unconnected | No internal connection; the datasheet recommends grounding this pin for better thermal performance but states it is not required. |
| 3 | NC | unconnected | No internal connection; the datasheet recommends grounding this pin for better thermal performance but states it is not required. |
| 4 | ADJUSTMENT | input | Feedback (adjust) terminal that sets the output voltage through an external two-resistor divider, with the output held 1.22 V to 1.292 V above this pin for the new die (1.25 V nominal) and an adjustment current typically 44 µA. |
| 5 | NC | unconnected | No internal connection; the datasheet recommends grounding this pin for better thermal performance but states it is not required. |
| 6 | OUTPUT | power_out | Regulated output that supplies 2.5 mA to 100 mA of load current across the 1.25 V to 37 V output range, with the output pins internally connected to one another. |
| 7 | NC | unconnected | No internal connection; the datasheet recommends grounding this pin for better thermal performance but states it is not required. |
| 8 | NC | unconnected | No internal connection; the datasheet recommends grounding this pin for better thermal performance but states it is not required. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Line regulation |  |  | 0.01 | 0.02 | %/V | VI – VO = 5V 至 35V, TJ = 25°C | 5 |
| Line regulation |  |  | 0.02 | 0.05 | %/V | VI – VO = 5V 至 35V, IO = 2.5mA 至 100mA | 5 |
| Ripple rejection |  | 55 |  |  | dB | VO = 10V, f = 120Hz | 5 |
| Ripple rejection |  | 66 | 80 |  | dB | VO = 10V，在调节端与接地端之间使用 10μF 电容器，f = 120Hz | 5 |
| Output voltage regulation (VO ≤ 5 V) |  |  |  | 25 | mV | VI – VO = 5V 至 35V，TJ = 25°C，IO = 2.5mA 至 100mA，VO ≤ 5 V | 6 |
| Output voltage regulation (VO ≥ 5 V) |  |  |  | 5 | mV/V | VI – VO = 5V 至 35V，TJ = 25°C，IO = 2.5mA 至 100mA，VO ≥ 5 V | 6 |
| Output voltage regulation (VO ≤ 5 V) |  |  |  | 50 | mV | VI – VO = 5V 至 35V，IO = 2.5mA 至 100mA，VO ≤ 5 V | 6 |
| Output voltage regulation (VO ≥ 5 V) |  |  |  | 10 | mV/V | VI – VO = 5V 至 35V，IO = 2.5mA 至 100mA，VO ≥ 5 V | 6 |
| Output voltage change with temperature |  |  |  | 10 | mV/V | TJ = 0°C 至 125°C | 6 |
| Long-term drift |  |  | 3 | 10 | mV/V | 1000 小时后，TJ = 125°C 且 VI – VO = 35V | 6 |
| Output noise voltage |  |  | 10 |  | µV/V | f = 10Hz 至 10kHz，TJ = 25°C | 6 |
| Minimum output current to maintain regulation |  |  | 1.5 | 2.5 | mA | VI – VO = 35V | 6 |
| Peak output current |  | 100 | 200 |  | mA | VI – VO ≤ 35V | 6 |
| Adjustment pin current |  |  | 50 | 100 | µA |  | 6 |
| Adjustment pin current change |  |  | 0.2 | 5 | µA | VI – VO = 2.5V 至 35V，IO = 2.5mA 至 100mA | 6 |
| Reference voltage (output to adjust) |  | 1.2 | 1.25 | 1.3 | V | VI – VO = 5.0V 至 35V，IO = 2.5mA 至 100mA，P ≤ 额定耗散 | 6 |
| Output voltage VO | Vo | 1.25 |  | 32 | V | 旧芯片 (CSO:SHE) | 4 |
| Input-to-output differential voltage | VI - VO | 2.5 |  | 32 | V | 旧芯片 (CSO:SHE) | 4 |
| Output current | IO | 2.5 |  | 100 | mA |  | 4 |
| Operating junction temperature | TJ | -40 |  | 125 | °C | LM317LI | 4 |
| Input-to-output differential voltage | VI - VO |  |  | 35 | V | 旧芯片 (CSO:SHE) | 4 |
| Operating junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C | 旧芯片 (CSO:SHE) | 4 |
| Junction-to-ambient thermal resistance (TSSOP, 8-pin, PW) | RθJA |  | 149.4 |  | °C/W | 旧芯片 (CSO:SHE) | 5 |

## CAD (KiCad official)

- Symbol: `LM317LIPW`
- Footprint: `Package_SO:TSSOP-8_3x3mm_P0.65mm`
- 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm317lipw-etched.step` / `lm317lipw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm317lipw.step` / `lm317lipw.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm317l) (39 pp, sha256 `d5c5d34eb4738e79`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lm317lipw-datasheet.pdf)